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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '456c536745fea0037d463f4679456d4a05a69e67bd333c881ffd62e16481a8c7' 
  AND token = 'hhgcHD/wHcK5OGERIg8vtx/8eavsHw4F3VjwYI4ucu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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