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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced07ab2c067297b1fc8925c3340f88ffd585270408d80dcaecad2c1d989f9b9' 
  AND token = '2nEhUyhGIG8XOdjLxFkOglEglL63+E4zA373Li1micw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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