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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c6bcc47a3ce09900ed96052cdcf157339a1cddf249c523aa6e1d24ff2063e20' 
  AND token = '13ZEqLkJxHc8JxElZ1la93uLvZfRrokS+u6/V8KIWCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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