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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d789a7f072a0b11ec971c18b40c0ed121a87ff323689b373b276bfaf7901968' 
  AND token = 'uPoEgc4pUVffr/ValBK2V4vmap8rnuZs4hDV1P5w11M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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