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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc94297f2c7308196cb67ae65e986ef9f1cd3be23ee3fbbca01a3a5e43acf47' 
  AND token = 'ceje+DhM8aQ6dPpBjl2xqSbgPRTFYHRBkX3sd/LiKDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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