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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34fec810f97f7ea4f3368bb8daf9b0e596ecc4a45e2bf5cb02ec7e43ab345c50' 
  AND token = '6iNjyf46b7xJVyV2c+58s1BaEWUbbAhxcdL9dg3MPVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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