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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d2fb2c8b1b50f7eaed8f7ce391dd1515bf11d5bfaec6816109852bca4df0ef' 
  AND token = 'oS7ehxOiSY6vlWouOWYb4RTqR0ygPdu9INR1SXVjBCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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