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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0016dcdbde87fab8f0fb835cf28f4167a7f0f9a37fb68ae39fbabb4b5959a449' 
  AND token = 'O4FrakVrlOZ1M8YdyHROxvqNzF3RCQCxnXp6/1+6Chw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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