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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8aaab28d2dd11b77815f0142fc5b820747adab80fde3006c57a9e51f908885f' 
  AND token = 'mKr7HSOVTugh/A8m0Baslr0YJ8pZy6V/KpxDjO/n1i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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