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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '515c54ed0b7ac94242a7f66208d423699ec73349478102678fe4224a8bbbc8a4' 
  AND token = '8D0FXF6rkf/6EpMCGuM2oIfQ7jotOhCoaFNgzaxxraw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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