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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ea729329d2c918acb55fcdcaf4a99198c01e5aa6bfa17052c82e6c88fb3027' 
  AND token = 'hjcSE+WPvXhAMEuqQvTcNSNTZunNh0MM2Ge3YfxWZ/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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