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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '534672f63c2a08f85e65df782617acceef51d9fd836fa625e0b5686f21d3e950' 
  AND token = 'D2raimXvXZO52oaRAhPCe7JdfUXATIQ8ez6c97jFY0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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