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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '313e507c5191c93c4284d06bcad343beea9c1af2e5dbbebf7642b9d400eb3259' 
  AND token = 'J8w1Ob1V3i21v40hKjlEc8sGsUm7fz9WrH4WamxOLo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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