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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c9902d7ff1d0e8885cd3cbc54b4595e2cdc4a11cde7348d924e4c5d35a7eb5' 
  AND token = 'EQv4btIWFDt23+GgG8rOexyvQJ+tUlOiZJH25aS2M14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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