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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd85506673dd3e11057cdf0f3c9c154b3551676f3383c43d7e6461865e36099' 
  AND token = '790vjyAkVinzAhsdl+NmjYUcahvyf7p3PuvG62AmCN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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