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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '625265e1db660f5f0492e8fe7d9dc62c6db7eed2012dc2d029cdc2c27503eb3e' 
  AND token = 'uUZYGOWd1WoTs5A1WqWXYUUOa0pa5dyM2kK9My1NmS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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