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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deebe93e45014046fa6865b3a768800891ddacfe2334e1b1de17612bdb334749' 
  AND token = '6mKdrSfRUUw37wFv9f4L5AEg9aN6f9Iw4p4p/6yN72g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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