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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f67252f1820d7904e0e8b47faae94dbc6db9e8942ccd156d1a3a5fd448d41f' 
  AND token = 'nZPNSfBX94CpJJ08iQ1k4+Im55Vcp87gu6ZNsbSGX5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}