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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf79943b270b87d71b6e62e10228195a3fdd5ccf0de8a1661b4c482cbeecfcc' 
  AND token = '5PTPJCgZUZciEII2jyUQ3C3qBF3mKfLzc9H9XPSiBg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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