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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e06decbfbaef295440cdae4994b8b4e185787ef9c28c89aeea87ed48b7d25672' 
  AND token = 'oENVDJbdsJRjpwc72HeIS1Lwv5OgAeUey9n/Ddih88k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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