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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9fb3e569296122a28e8560bd6d7cdb71c6f62b15dc450fca3f4d4327e18fa3b' 
  AND token = '81m4/Xm8jbpmMIw9byeU9SLcU7DOhRKE6JgfW61ur7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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