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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46597f42ce38d319aef7995a47be7497bee313af14917d4d9e855c273cb2565b' 
  AND token = 'uIaulwHjFsZALFYy3/aP2Ac1WTV6bAvaBjnOQnK6cig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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