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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29dc52e1d4e3c0d8c9c2decf594c3a2ce520753593f0e8f7484ecb04b2623fe0' 
  AND token = '0IWmKW7mbFZ6wFJPb8AgHtlAuwv+qZyOmhcOfwyCM3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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