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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c851361e62b5d11ad905e85f5583a00a8b16570be9d3e444dd86f06b341f4ac' 
  AND token = '/XptMb4eXnmdxmA5qLMnYJOlrYGD+0A7gt0dQogv1o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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