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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83050fbb3685db44031f74823e03451cb0b4934db96c0e4adaf7875a42b4b28e' 
  AND token = 'a4uCpJ3vTPb3yUk2skCpILvR66+ryLg6PNXD2Y4r84Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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