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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38ac45a03a5f114b3c4a509cd2d7dbd2dbcf96156c119ed03135fd3adc175773' 
  AND token = 'RLW0pmrHD8W2PbB71s7iFkerzKSv6sem4FVG4a14anE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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