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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '087f3cbe068f75ed01faa521b54e6fac8fc9e4d004135e5bbecdd7590c52100a' 
  AND token = '/PHRMIYmm0/yp7dA0HDktN3mSPVM3QHLd3ISUeAUVKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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