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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0867db908ab8a72d0dbb43d7c8062f0959e826114cca5c8d24f12e853442f1a' 
  AND token = 'F864J5Hfc7Uw0GhWA8DgJO5OGqszFKqlmeGs/aQScr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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