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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '086bb3649b2a1bfb85b84d97a44c537472207759b3493b1924ab04a9e001bf8a' 
  AND token = '0JNCOIFALt9eKD/wj9v5fc+58ZzSGEjoSjwkKEu+gKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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