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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc415523149f65e713e20fc34d8e1061fb3a2200f8216ba2c98df3cd7a28091' 
  AND token = 'aT7r5C+ru3yek1q9ga1GplUMwtn9umjsmxCubub+2pU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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