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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f17880efd218010c57778ae791307690d0dc141f5cc038884d4731faddab9e2' 
  AND token = 'Ij0qb0w6ynlcgj6o2Fwm+HdNkqAd74ANYGZ7HSAaOs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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