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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd1730846d03250cbcc37755c7dd33ff23b798fcc68ad10c4dcc8760260e5a29' 
  AND token = 'kBFBu+wO2FebV2BbLPVVAmFQBgLvHIQNb/agNDphW9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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