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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa27d4ff5be19134995bf385b56a688a60641415647d3b793bcf93abc16edebb' 
  AND token = 'pxi5eeXQl1ayCgEYAivAiR/L+T9+QFRFqGHLtewt9dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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