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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea886f1ac7398ac7d64d531b8be3cfabba022e8707f24eae3aeda48e5c7bdc4' 
  AND token = '7UMt0gv94A9SCFfrc4xWtM96lB1OpXIsjLFNpHG4WWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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