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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d70a2b58fa5a79c50774482760d8b4355520c220d274ef2d488bc9d7f6f650a' 
  AND token = '3dtSlqen9qDXmakk26cuG4fQwIECU9H5+23BVEwf7qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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