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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd4636098a90f6faecffd6cd404a1d8a61758be01ad20f2439e49cff7bb27f5' 
  AND token = '5ZFecycI54gjJ4eHKRJ9mjX5i2ez2YOB0KmpystM4Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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