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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f02c1146bf08747cee9ed91980f39208f822734880e8a1cd657c8e408205de' 
  AND token = 'n59xsLww8LwRJ4aN8VLoADwFRBbTm1aPPsD5oX/5N/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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