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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb277fe51c121c6d6604330e953023728a86a9e746adb7570166b27fdacea6ea' 
  AND token = 'bPgTQ/ndgk2O2I3Z8OwsDKYpe0cZA0vCR+DuXEH0Rq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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