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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b539abff0c4551ead46b60c138b01a5bd8bf9449875cf8939f2949ca1c88f9' 
  AND token = 'NNvwRee39qt8aEDBt+lk3EaKVrl6EY/eMDAMXgQrtLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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