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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10cd2e7a6cdd27a33f240ff10c26442b8568fef4dba467b598e4eaa102cc4879' 
  AND token = 'QvnlIKU7yzTX0uesgKsev5wz3mDLWGbtUaER9GCySAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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