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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18ea5619211019f1a7703fa1bf0336bac177fc5bf43ab12a6b72490a1104f42e' 
  AND token = 'gJzjCH6gnt2PzSQfvvr14krfAR1YUbqRgTCPrtF5+pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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