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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3a47d88e4d71cd01dbb4fdd8fa86ff694cc7ca33aacfea01f614861c44229b7' 
  AND token = 'Fto7i68rVcFgcquS3+Tk4XCx2W8GtkDF2Tj1LXjNAZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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