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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc67158478a42dbc783a40984a7f94401e9a9749d5f9c497dc633712507563bb' 
  AND token = 't0MVoojYeuEd8dISkibSSeZFmr4NkvsTXSmnrkvSgKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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