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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713718870dc5c931f8e1b4568a4c56716ed8f6bb402f58afa045f440ccf98cb8' 
  AND token = 'vbRUIpZnmUDJEf2GZOJTRxC3z/BCEPxM0gu1mTBE4k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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