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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa2e66766ecf03ab2e4bcf9d9ea748e5341768aa3cf9683737c77e03aa2f8ea9' 
  AND token = 'lRO6uGHOQwVNJ1LUja17AQ9Rpl5vfmWGC40sROdrbtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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