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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cbee3e6144c4b854b5ac155cb24c8157f965c3a8be6fd70fac27306c7ca756d' 
  AND token = 'e1gP3RZNmPJ2NqfmADpZIMVSuFQ7XpL8cuAtzJjBmYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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