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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ca244c2ec501c08db0022418ff9c789f6b743e7c75cf2ebd39c0a8950db21e' 
  AND token = 'dCp6np5UQIXMO8a1H80ef+WsEXj79EqB+w2nK8cYNKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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