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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f55dd77a09120c09224df4d571808c4830c761a6dc94fe192e08ab2252f9247' 
  AND token = '8G0Xd+BYHdQ+/XKmpSBNSnaJFOtf4InWK57dcHq0qdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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