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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3602d8a72a0e82da5dea26803b47ee02846365af09f2bbe3f65413259509c21b' 
  AND token = 'aH4NqwKQcx/mejEzXUfQlHu/Jd1xoHJOvW1yrCQ5gTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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