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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab16fd2df148d0097f1658a0576e0dbebd788487ff93767977d9224a96b9de84' 
  AND token = '2olZPVLSSn7T0+mQOBD7FrXOCJ2JK3vA21+XqP3D9GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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