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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e30abcc5609f4f28ad970aa2ec3caab66d8109f6c6a195258747e5345337453' 
  AND token = 'lEfCqYnbH5zkW6+z0X54sX0edIuX+Jf0ePyG6a1Brio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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