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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9fee075345f412ce638e0b32eafb20d655cc9912c795877c6f7b3db0c0007c' 
  AND token = '+t0MRLn7P1yvbZ5Xu9plpcO85sKeEpGaM1SvAQH91JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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