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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c125984229a393722d5a6aecbe07f3d1547f71577b38071b733f4d3ee7ec5231' 
  AND token = '/7dLLFYAkcxz7ameBV77uto6lpr8QbU+dcDP00G1aPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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