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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f8a7f1c893200fdd9feab0fde6cb30dafef2e56c0d76c67565dff7c9d57dd94' 
  AND token = 'G+6uxm/jV0oSaUn8Ypv0+1s0q7iYlRv6/cMuX6q0naE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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