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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8bb2c2709d52af405f6ec3dc7333098d2a006d2e4a7f29a1d2ea1d6c574b428' 
  AND token = '+caXIwS1Xf+voKcq7WLdQkjxPn4WyL/n5poI7309Bc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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