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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71090b0daf94fcd49874349e571bd7e5247bc157ca810737566f5365637b767' 
  AND token = 'Obab0f6Lgb9zYy+Q97Og9JYa17d2C21IR6VlS+H6oJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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